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Sensitivity of motional Stark effect on different beam energy components for radial electric field measurements in tokamak plasmas
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作者:

Ko, Juyoung
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机构:
Korea Inst Fus Energy, Daejeon, South Korea
Univ Sci & Technol, Daejeon, South Korea Korea Inst Fus Energy, Daejeon, South Korea

Ko, Jinseok
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机构:
Korea Inst Fus Energy, Daejeon, South Korea
Univ Sci & Technol, Daejeon, South Korea Korea Inst Fus Energy, Daejeon, South Korea
机构:
[1] Korea Inst Fus Energy, Daejeon, South Korea
[2] Univ Sci & Technol, Daejeon, South Korea
基金:
新加坡国家研究基金会;
关键词:
E-R;
SHEAR;
D O I:
10.1063/5.0219593
中图分类号:
TH7 [仪器、仪表];
学科分类号:
0804 ;
080401 ;
081102 ;
摘要:
Measurement of the internal magnetic field is crucial for determining the equilibrium, stability, and current density of a plasma in a tokamak. A motional Stark Effect (MSE) diagnostic was developed to provide a measurement of the internal magnetic field in tokamaks by analyzing the emission from the interaction of the plasma particle with an injected neutral beam. The Stark effect causes the shifting and splitting of deuterium spectral lines due to the Lorentz electric field. However, it is difficult to accurately measure the internal magnetic field components since the radial electric field inherently formed inside the plasma is mixed with the Lorentz field. Under the circumstances in the Korea Superconducting Tokamak Advanced Research (KSTAR) device, one possible approach is to derive a radial electric field by measuring and comparing the polarization angles from the full and half-energy components of the neutral beam. To utilize the polychromatic MSE diagnostics in KSTAR, the half-energy component wavelength bands according to various magnetic field and beam energy combinations have been calculated, and the filter combinations required for those measurements have been selected. The Stokes-filter model used to evaluate the effect of multiple-ion-source neutral beam injection on the MSE measurements has been extended to infer the sensitivity of this approach to take the non-ideal bandpass filter effects into account.
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